JP2010261685A - Heat exchanger - Google Patents

Abstract

To provide a heat exchanger capable of preventing a water pipe and a refrigerant pipe from being deformed to collapse a flow path.
A water heat exchanger 22 includes a refrigerant pipe 121 composed of a pair of multi-hole flat tubes 122 and 123, and a water pipe 125. Each of the multi-hole flat tubes 122 and 123 of the refrigerant pipe 121 has refrigerant flow paths 122a and 123a through which the refrigerant flows. The water pipe 125 has a water flow path 125a through which water flows, and is formed as a flat pipe. The refrigerant pipe 121 and the water pipe 125 are bonded adjacent to each other to form a pipe 120. The pipe 120 is bent so as to draw an arc around the bending axis ax1 along the short side in the cross section orthogonal to the longitudinal direction of the refrigerant pipe 121.
[Selection] Figure 6

Description

  The present invention relates to a heat exchanger.

2. Description of the Related Art Conventionally, as a refrigeration apparatus for a heat pump type hot water supply apparatus, for example, one constituted by a compression refrigeration circuit using CO ₂ as a refrigerant has been widely used. Such a refrigeration apparatus includes a water heat exchanger that performs heat exchange between the refrigerant and water. The water heat exchanger has a refrigerant pipe through which the refrigerant flows and a water pipe through which the water flows, and heats the water by exchanging heat between the refrigerant and water by flowing the fluids facing each other. can do.

  As the hydrothermal heat exchanger, those disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2007-271213) and those disclosed in Patent Document 2 (Japanese Patent Laid-Open No. 2004-218946) are known. ing. The water heat exchanger of Patent Document 1 has a structure in which a refrigerant pipe is spirally wound around a water pipe. The hydrothermal exchanger of Patent Document 2 has a structure in which a plurality of refrigerant tubes are brought into close contact with the side surface of a water tube that is a flat tube. In addition, in the water heat exchanger of patent document 2, a water pipe and a refrigerant | coolant pipe have a structure where the water pipe and the refrigerant | coolant pipe | tube were closely_contact | adhered by being enclosed by a restraint pipe | tube.

  Meanwhile, the water heat exchanger includes a laminated heat exchanger made of aluminum. The water pipe and the refrigerant pipe used in this stacked heat exchanger are often flat pipes that extend in the longitudinal direction so that they are in close contact with each other as in Patent Document 2. . Generally, the joined water pipe and the refrigerant pipe are bent around a bending axis along a long side (long side of the refrigerant pipe or the water pipe) in a cross section orthogonal to the longitudinal direction. However, since a flow path through which water or refrigerant flows is formed inside each of the water pipe and the refrigerant pipe, when the water pipe and the refrigerant pipe are bent around the axis along the long side, the water pipe and the refrigerant pipe are compressed. In some cases, the flow path may be crushed. Then, the flow of water and refrigerant deteriorates, and the performance of the water heat exchanger itself deteriorates. In particular, the flow path has a rectangular cross section, and the larger the area, the easier it is to collapse.

  Then, an object of this invention is to provide the heat exchanger which can prevent that a water pipe and a refrigerant pipe deform | transform and a flow path is crushed.

  The heat exchanger according to the first aspect includes a first pipe and a second pipe. The first pipe has a first flow path through which the first fluid flows. The second pipe has a second flow path through which the second fluid flows, and is formed as a flat pipe. The second fluid is a fluid different from the first fluid. The first pipe and the second pipe are bonded adjacent to each other to form a pipe. The pipe is bent so as to draw an arc around the bending axis along the short side in the first cross section orthogonal to the longitudinal direction of the second pipe.

  In this heat exchanger, the pipe is bent around the bending axis along the short side instead of the long side in the first cross section of the second pipe perpendicular to the longitudinal direction. Thereby, since the 1st pipe and the 2nd pipe are hard to be pressed, it can prevent that piping changes and a 1st channel and / or a 2nd channel are crushed. In particular, the deformation of the second pipe that is a flat pipe can be prevented.

  A heat exchanger according to a second aspect is the heat exchanger according to the first aspect, wherein the second pipe has a plurality of second flow paths arranged along the long side in the first cross section.

  In this heat exchanger, the second tube is formed of a so-called multi-hole flat tube. Accordingly, the pipe is not bent about the axis along the long side of the second pipe in which the plurality of second flow paths are arranged, but is bent along the short side of the second pipe. In addition, not only the second tube but also the first tube may be a flat tube.

  The heat exchanger which concerns on invention 3 is a heat exchanger which concerns on invention 1 or 2, Comprising: As for piping, the 2nd cross section orthogonal to a longitudinal direction is a rectangular shape. The bending axis is substantially parallel to the short side of the second cross section of the pipe.

  According to this heat exchanger, the bending axis is along the short side of the second pipe and the short side of the pipe, and the pipe is bent around the bending axis. Thereby, it is possible to further prevent the pipe from being deformed and the first flow path and / or the second flow path from being crushed without inserting a metal core or the like into the pipe.

  A heat exchanger according to a fourth aspect of the present invention is the heat exchanger according to any one of the first to third aspects, wherein the pipe is bent a plurality of times around the bending axis and stacked in one direction along the bending axis. Yes.

  According to this heat exchanger, the pipes are stacked along the bending axis direction. In particular, as described in Invention 3, even in a pipe having a rectangular second cross section, the pipe is bent around a bending axis along the short side of the pipe, and is unidirectional along the bending axis. Are stacked. That is, the piping which concerns on the invention 3 is piled up along the short side. Therefore, when the height of the piled pipe is bent and piled around the axis along the long side in the second cross section of the pipe (that is, the axis along the long side in the first cross section of the second pipe). It becomes lower than that. Therefore, the heat exchanger can be made compact.

  A heat exchanger according to a fifth aspect of the present invention is the heat exchanger according to the fourth aspect of the present invention, wherein the pipe is bent a predetermined number of times in the first direction around the bending axis and then opposite to the first direction around the bending axis. Is bent in the second direction.

  When the pipes are bent and stacked only in one direction, the height of the stacked pipes is not constant depending on the portion where the pipes are started to be stacked, and a step is generated on the upper surface of the pipes. However, in this heat exchanger, since the pipe is bent a predetermined number of times in one direction and then bent in the opposite direction, the height of the step can be reduced.

  A heat exchanger according to a sixth aspect of the present invention is the heat exchanger according to the fifth aspect of the present invention, wherein the pipes are stacked while drawing an arc having a first radius of curvature when bent in the first direction. Conversely, when the pipe is bent in the second direction, it is stacked while drawing an arc having a second radius of curvature different from the first radius of curvature.

  According to this heat exchanger, pipes are bent and stacked so as to draw arcs with different radii of curvature according to the bending direction. For example, when the bending direction is the second direction, the pipes are bent and stacked so that the radius of curvature is larger than when the bending direction is the first direction. That is, in this case, if the bending direction is the second direction, the pipe is newly stacked on the outside of the pipes stacked when the bending direction is the first direction. This makes it possible to reduce the height of the stacked pipes as compared to the case where the pipes are stacked while always drawing an arc having a constant curvature radius regardless of the bending direction.

  The heat exchanger which concerns on the invention 7 is a heat exchanger which concerns on either of the inventions 1-6, Comprising: A 1st pipe | tube is a flat tube which has one 1st flow path. The second pipe has a plurality of second flow paths, and two second pipes are provided so as to sandwich one first pipe.

  This heat exchanger has a structure in which two second tubes sandwich one first tube, and each second tube sandwiching the first tube is formed of a multi-hole flat tube. Also in such a heat exchanger, the pipe is bent around the bending axis along the short side in the first cross section of the second pipe. Therefore, it is possible to prevent the first flow path of the first pipe and / or the second flow path of the second pipe from being crushed without inserting a metal core or the like into the pipe.

  According to the heat exchanger according to the first aspect of the invention, the first pipe and the second pipe are not easily compressed, so that it is possible to prevent the pipe from being deformed and the first flow path and / or the second flow path from being crushed. In particular, the deformation of the second pipe that is a flat pipe can be prevented.

  According to the heat exchanger according to the second aspect of the present invention, the pipe is not bent about the axis along the long side of the second pipe in which the plurality of second flow paths are arranged, but along the short side of the second pipe. Bend.

  According to the heat exchanger according to the third aspect of the present invention, it is possible to further prevent the pipe from being deformed and the first flow path and / or the second flow path from being crushed without inserting a metal core or the like into the pipe. it can.

  According to the heat exchanger according to the fourth aspect, the heat exchanger can be made compact.

  According to the heat exchanger according to the fifth aspect of the present invention, since the pipe is bent a predetermined number of times in one direction and then bent in the reverse direction, the height of the step can be reduced.

  According to the heat exchanger according to the sixth aspect of the present invention, the height of the stacked pipes can be reduced as compared with the case where the pipes are stacked while always drawing an arc having a constant curvature radius regardless of the bending direction.

  According to the heat exchanger according to the seventh aspect of the present invention, the first flow path of the first pipe and / or the second flow path of the second pipe is prevented from being crushed without inserting a metal core or the like into the pipe. Can do.

The block diagram of the heat pump type hot-water supply apparatus provided with the water heat exchanger. Sectional drawing which shows the internal structure of a freezing apparatus. The figure which shows the structure of a freezing apparatus typically. The exploded view of the refrigerant | coolant pipe | tube and water pipe which comprise piping of the water heat exchanger which concerns on this embodiment. Sectional drawing in the VV cut surface of FIG. 4 of piping formed by joining a refrigerant pipe and a water pipe. The figure for demonstrating how to bend the piping of the water heat exchanger which concerns on this embodiment. The external view of piping after being bent. The top view and side view of piping after being bent. (A) Sectional drawing of piping which concerns on other embodiment (a). (B) Sectional drawing of piping which concerns on other embodiment (b).

  Hereinafter, a heat exchanger according to the present invention will be described with reference to the drawings.

(1) Configuration of Heat Pump Type Hot Water Supply Apparatus FIG. 1 is a configuration diagram of a heat pump type hot water supply apparatus 1 including a water heat exchanger 22 that is a heat exchanger of the present invention. The heat pump type hot water supply apparatus 1 includes a refrigeration apparatus 2, a hot water storage apparatus 3, and a control unit 6. The refrigeration apparatus 2 mainly includes a compressor 21, an accumulator 21a, a water heat exchanger 22, an expansion valve 23, an air heat exchanger 24, and a fan 27 (FIG. 2). As shown in FIG. 1, the compressor 21, the refrigerant pipe 121 in the water heat exchanger 22, the expansion valve 23, the air heat exchanger 24, and the accumulator 21 a provided on the suction side of the compressor 21 are refrigerant pipes The refrigerant circulation circuit 20 is configured in a ring shape. An example of the refrigerant flowing in the refrigerant circulation circuit 20 is CO ₂ .

  Further, the refrigerant circulation circuit 20 includes a gas heat exchanger 26 for exchanging heat between the high-pressure and high-temperature refrigerant coming out of the water heat exchanger 22 and the low-pressure and low-temperature refrigerant coming out of the air heat exchanger 24. Is arranged. The gas heat exchanger 26 performs heat exchange between a refrigerant passage connecting the water heat exchanger 22 and the expansion valve 23 and a refrigerant passage connecting the air heat exchanger 24 and the accumulator 21a.

  Further, the refrigeration apparatus 2 includes an outside air temperature sensor 8 that detects the outside air temperature at the installation location, a discharge pipe temperature sensor 9 that detects the discharge pipe temperature of the compressor 21, and heat exchange that detects the temperature of the air heat exchanger 24. A temperature sensor 10 is provided. Detection signals from these sensors are input to the control unit 6.

  The hot water storage device 3 mainly includes a hot water storage tank 31 and a water circulation pump 32. The hot water storage tank 31, the water pipe 125 in the water heat exchanger 22, and the water circulation pump 32 are connected in an annular shape by a water pipe 35, and constitute a water circulation circuit 30. The hot water storage tank 31 is a tank for storing water warmed by the water heat exchanger 22, and the water circulation pump 32 is configured so that the temperature of the water heated by the water heat exchanger 22 is about 85 ° C., for example. In addition, the amount of water circulation is controlled.

  The control unit 6 is a microcomputer comprising a CPU and a memory, and is connected to an outside air temperature sensor 8, a discharge pipe temperature sensor 9, a heat exchange temperature sensor 10, an inverter 7 and an expansion valve 23 as shown in FIG. Yes. The control unit 6 adjusts the opening degree of the expansion valve 23 in order to control the amount of water circulated by the water circulation pump 32 in order to keep the temperature of the water heated by the water heat exchanger 22 at about 85 degrees. In addition, the control unit 6 controls the opening degree of the expansion valve 23 so that the discharge pipe temperature detected by the discharge pipe temperature sensor 9 approaches the target discharge pipe temperature, or the outside air temperature sensor 8 and the heat exchange temperature sensor 10. The target discharge pipe temperature is set on the basis of the temperature detection signal from.

[Refrigeration equipment]
FIG. 2 is a cross-sectional view showing the internal structure of the refrigeration apparatus 2. In FIG. 2, the right compartment of the heat insulation wall 2c is the machine room 2a, and the left compartment of the heat insulation wall 2c is the ventilation chamber 2b. A compressor 21 and an expansion valve 23 are arranged in the machine room 2a. A fan 27 and a water heat exchanger 22 are installed in the blower chamber 2b.

  The fan 27 is installed in the front in the front view of the ventilation chamber 2b of FIG. A motor that drives the fan 27 is disposed behind the fan 27 in a state of being fixed to the motor support base 28. The water heat exchanger 22 is disposed below the fan 27 with the heat insulating wall 2d interposed therebetween. The water heat exchanger 22 will be described in detail in “(2) Water heat exchanger”. Moreover, in FIG. 2, the air heat exchanger 24 is arrange | positioned along the left side wall and back wall of the ventilation chamber 2b, and the right end of the air heat exchanger 24 is extended to the center of the machine chamber 2a.

  An electrical component box 4 is installed inside the refrigeration apparatus 2. The electrical component box 4 is disposed so as to straddle the upper part of the machine room 2a and the upper part of the blower room 2b. The electrical component box 4 includes a control unit 6, an inverter 7 (see FIG. 3), and the like. The inverter 7 generates a drive signal for driving a compressor motor (not shown) of the compressor 21 and outputs the drive signal to the compressor motor.

(2) Water heat exchanger Next, the water heat exchanger 22 which concerns on this embodiment is demonstrated using FIGS.

  The water heat exchanger 22 includes fins (not shown) in addition to the refrigerant pipe 121 (corresponding to the second pipe) and the water pipe 125 (corresponding to the first pipe). Exchanges heat with flowing water. In the following, the refrigerant pipe 121 and the water pipe 125 will be specifically described except for fins not shown.

(Refrigerant tube)
As shown in FIGS. 4 and 6, the refrigerant pipe 121 extends long in the Y direction and includes a pair of multi-hole flat tubes 122 and 123. The multi-hole flat tubes 122 and 123 are positioned so as to sandwich the water tube 125, and each of the multi-hole flat tubes 122 and 123 has a plurality of refrigerant flow paths (first flow channels) through which refrigerant (second fluid) flows. 122a and 123a). And the cross section (1st cross section) orthogonal to the longitudinal direction (namely, Y direction) of the multi-hole flat tubes 122 and 123 is a rectangular shape as shown in FIG. The plurality of refrigerant flow paths 122a and 123a are arranged side by side along the long sides of the cross section of the multi-hole flat tubes 122 and 123 (that is, along the X direction), and the multi-hole flat tubes 122 and 123 are arranged. It extends along each longitudinal direction (Y direction). Thus, the refrigerant | coolant pipe | tube 121 is comprised by the multi-hole flat pipes 122 and 123 which have several refrigerant | coolant flow paths 122a and 123a, and the heat transfer rate by the side of a refrigerant | coolant is improved.

  In addition, although the refrigerant | coolant pipe | tube 121 which has the structure mentioned above can be formed with aluminum, copper, stainless steel, etc., in this embodiment, the case where the refrigerant | coolant pipe | tube 121 is formed with aluminum is taken as an example. The refrigerant pipe 121 is manufactured by drawing or extruding.

  A refrigerant pipe header (not shown) is connected to the tip of the refrigerant pipe 121.

〔Water pipe〕
As shown in FIGS. 4 and 6, the water pipe 125 extends in the Y direction along the refrigerant pipe 121 (specifically, the pair of flat pipes 122 and 123), and is configured by a single flat pipe. ing. More specifically, the water pipe 125 extends so as to be sandwiched between a pair of multi-hole flat tubes 122 and 123, and a cross section perpendicular to the longitudinal direction (that is, the Y direction) of the water pipe 125 is shown in FIG. Thus, it has a rectangular shape. The length of the long side (that is, the X direction) in the cross section of the water pipe 125 is substantially the same as the length of the long side in each of the multi-hole flat tubes 122 and 123 of the refrigerant pipe 121. In addition, inside the water pipe 125, one water flow path 125a through which water flows instead of the refrigerant is provided. The water channel 125a extends along the longitudinal direction (Y direction) of the water pipe 125, and has a rectangular cross section.

  Further, a clad layer is formed on the two surfaces 125b and 125c including the long side (X direction) in the cross section of the water pipe 125 and the longitudinal direction (Y direction) of the water pipe 125 (FIGS. 4 and 5). Yes. The surfaces 125b are located opposite to each other with the water channel 125a interposed therebetween. The water pipe 125 is in surface contact with the surfaces 122b and 123b of the multi-hole flat tubes 122 and 123 constituting the refrigerant pipe 121 on the two surfaces 125b and 125c, respectively. The surface 122b of the multi-hole flat tube 122 and the surface 125b of the water tube 125, and the surface 123b of the multi-hole flat tube 123 and the surface 125c of the water tube 125, which are in contact with each other, are joined by brazing, so that the pipe 120 ( (To be described later). That is, the refrigerant pipe 121 and the water pipe 125 are bonded in a state adjacent to each other to form the pipe 120. Here, the surfaces 122b and 123b of the multi-hole flat tubes 122 and 123 are surfaces including the long side (X direction) and the longitudinal direction (Y direction) of the refrigerant tube 121 in the cross section of the multi-hole flat tubes 122 and 123, respectively. Of these, the surface is located on the water pipe 125 side. The piping 120 will be described later.

  Note that the water pipe 125 having the above-described configuration can be formed of aluminum, copper, stainless steel, or the like. However, in the present embodiment, like the refrigerant pipe 121, the water pipe 125 is formed of aluminum as an example. To take. Similar to the refrigerant pipe 121, the water pipe 125 is manufactured by drawing or extrusion.

  A water pipe header (not shown) is connected to the tip of the water pipe 125.

〔Piping〕
Next, the piping 120 according to the present embodiment will be described.

  As shown in FIGS. 4 and 6, the pipe 120 extends in the longitudinal direction (Y direction) of the refrigerant pipe 121 and the water pipe 125 in a state where the pipe 120 is configured by joining the refrigerant pipe 121 and the water pipe 125. The cross section (second cross section) of the pipe 120 orthogonal to the longitudinal direction (Y direction) has a rectangular shape as shown in FIG. Specifically, the long side in the cross section of the pipe 120 according to the present embodiment is parallel to the direction (X direction) of the long side of each of the multi-hole flat tubes 122 and 123 and the water pipe 125 constituting the refrigerant pipe 121, The short side in the cross section of the pipe 120 is parallel to the direction of the short side of each of the multi-hole flat tubes 122 and 123 and the water pipe 125 (the Z direction in FIGS. 5 and 6).

  Such a pipe 120 is bent so that the water heat exchanger 22 becomes compact. In particular, the pipe 120 according to the present embodiment has a cross section of each of the multi-hole flat tubes 122 and 123 as shown in FIG. With the bending axis ax1 along the short side as the center, it is bent so as to draw an arc. That is, the piping 120 does not use the axis along the long side direction (X direction) in the cross section of each of the multi-hole flat tubes 122 and 123 constituting the refrigerant pipe 121 as a bending axis, but in the short side direction (Z And a bending axis ax1 that is substantially parallel to the direction). Here, as described above, since the short side in the cross section of the pipe 120 is substantially parallel to the short side in the cross section of each multi-hole flat tube 122, 123, the bending axis ax1 of the pipe 120 is It is substantially parallel to the short side in the cross section. That is, the bending axis ax1 can be said to be an axis along the short side in the cross section of the pipe 120.

  As shown in FIGS. 6 to 8, such a pipe 120 is bent a plurality of times around the bending axis ax <b> 1 described above and stacked in one direction along the bending axis ax <b> 1. Here, the one direction is a direction parallel to the bending axis ax1 and the direction of the short side (Z direction) in the cross section of the multi-hole flat tubes 122 and 123, and in FIGS. Show. Further, as shown in FIGS. 7 and 8, the pipe 120 is bent a predetermined number of times in the first direction A with the bending axis ax1 as the center, and then the second direction opposite to the first direction A with the bending axis ax1 as the center. Bent in direction B. That is, the pipe 120 is fixed without changing the bending axis ax1, but the bending direction is switched to the reverse direction during the bending process. In particular, when bent in the first direction A, the pipe 120 is stacked while drawing an arc of the first curvature radius, and when bent in the second direction B, the pipe 120 has a second curvature different from the first curvature radius. It is piled up while drawing an arc of radius.

  Summarizing the bending method of the pipe 120 described above, the pipe 120 is first bent, for example, seven times (corresponding to a predetermined number of times) in the first direction A around the bending axis ax1 along the short side of the cross section. Stacked in the direction z1. At this time, the pipe 120 is bent at a predetermined radius of curvature and stacked in the direction z1. After being bent seven times in the first direction A, the pipe 120 is bent once in a so-called 8-shape, and the bending direction is switched to the second direction B opposite to the first direction A. In the present embodiment, a case where the bending direction is switched once is taken as an example. After that, the pipe 120 is bent in the second direction B with a radius of curvature larger than the radius of curvature when the bending direction is the first direction A, and stacked in the direction z2. That is, the pipe 120 is bent outward in the second direction B, and the pipe 120 is bent in the first direction A and stacked. Thereby, as shown in FIGS. 7 and 8, the pipe 120 has a shape having a step 120a stacked on the inner side and a step 120b stacked on the outer side (FIG. 8).

  According to the above bending method, the pipe 120 is lower in height than the case where the pipe 120 is bent a plurality of times around the axis along the long side (X direction) and stacked in one direction. Further, since the bending direction is switched once from the first direction A to the second direction B, a step on the upper surface of the pipe 120 is less likely to occur than when the bending direction is always a constant direction.

(3) Effect (A)
In the water heat exchanger 22 according to the present embodiment, as shown in FIG. 6, the pipe 120 is centered on the bending axis ax1 along the short side in the cross section of the multi-hole flat tubes 122 and 123 constituting the refrigerant pipe 121. Bend. Thereby, since the refrigerant pipe 121 and the water pipe 125 are hard to be pressed, it is possible to prevent the pipe 120 from being deformed and the refrigerant flow paths 122a and 123a and the water flow path 125a from being crushed.

(B)
Moreover, in the water heat exchanger 22 according to the present embodiment, the refrigerant pipe 121 is formed of multi-hole flat tubes 122 and 123 having a plurality of refrigerant flow paths 122a and 123a. Therefore, the pipe 120 is not bent around the axis along the long side where the plurality of refrigerant flow paths 122a and 123a are arranged, but has the bending axis ax1 along the short side of the multi-hole flat tubes 122 and 123. Bent as center.

(C)
Further, according to the water heat exchanger 22 according to the present embodiment, the bending axis ax1 is along the short side of the multi-hole flat tubes 122 and 123 and the short side of the pipe 120, and the pipe 120 has the bending axis ax1. Bent as center. Accordingly, it is possible to further prevent the refrigerant flow paths 122a and 123a and the water flow path 125a from being crushed by deforming the pipe 120 without inserting a metal core or the like into the pipe 120.

(D)
Moreover, according to the water heat exchanger 22 which concerns on this embodiment, the piping 120 will be in the state piled up along the bending-axis ax1 direction. In particular, the pipe 120 according to the present embodiment has a rectangular cross section, is bent around a bending axis along the short side in the cross section, and is stacked along the short side. Therefore, the height of the stacked pipes 120 is bent and stacked around an axis along the long side in the cross section of the pipe 120 (that is, an axis along the long side in the cross section of the multi-hole flat tubes 122 and 123). It becomes lower than the case. Therefore, the water heat exchanger 22 can be made compact.

(E)
When the pipes 120 are bent and stacked in only one direction, the height of the stacked pipes 120 is not constant depending on the part where the pipes 120 are started to be stacked, and a step is generated on the upper surface of the pipes 120. However, in the water heat exchanger 22 according to the present embodiment, the pipe 120 is bent a predetermined number of times in the first direction A and then bent in the reverse direction (specifically, in the second direction B). Can be reduced in height.

(F)
Moreover, in the water heat exchanger 22 according to the present embodiment, when the pipe 120 is bent in the first direction A, the pipe 120 is stacked while drawing an arc having the first radius of curvature. Conversely, when the pipe 120 is bent in the second direction B, the pipe 120 is stacked while drawing an arc having a second radius of curvature different from the first radius of curvature. That is, the pipe 120 is bent and stacked so as to draw an arc having different radii of curvature according to the bending direction. Specifically, as shown in FIGS. 7 and 8, when the bending direction is the second direction B, the pipe 120 is arranged so that the radius of curvature is larger than that in the case where the bending direction is the first direction A. It is bent and stacked. That is, in this case, if the bending direction is the second direction B, the piping 120 is newly stacked outside the piping 120 stacked when the bending direction is the first direction A. Thereby, the height of the piled pipes 120 can be reduced as compared with the case where the pipes 120 are piled up while always drawing an arc having a constant curvature radius regardless of the bending direction.

(G)
Moreover, the water heat exchanger 22 according to the present embodiment has a structure in which a pair of multi-hole flat tubes 122 and 123 sandwich one water tube 125. Also in such a water heat exchanger 22, the pipe 120 is bent around the bending axis ax1 along the short side in the cross section of the multi-hole flat tubes 122 and 123. Therefore, it is possible to prevent the refrigerant flow paths 122a and 123a and the water flow path 125a from being crushed without inserting a metal core or the like into the pipe 120.

<Other embodiments>
(A)
In the above embodiment, the case where the pipe 120 has a three-layer structure in which one water pipe 125 is sandwiched between the pair of multi-hole flat tubes 122 and 123 has been described. However, as shown in FIG. 9A, the pipe according to the present invention is composed of one water pipe 325 that is a flat tube and one refrigerant pipe 321 that is a multi-hole flat tube. It may be a layered structure.

  In FIG. 9A, the cross section of the pipe 320 constituted by the water pipe 325 and the refrigerant pipe 321 is a square. Thus, even if the cross section of the pipe 320 is not rectangular, the present invention is applicable. In this case, the pipe 320 is bent around the bending axis along the short side of the water pipe 325 or the refrigerant pipe 321.

(B)
FIG. 9B shows a cross section of the pipe 520 when the water pipe 525 is a flat pipe as in the above embodiment, but the refrigerant pipe 521 is not a multi-hole flat pipe. The pipe 520 is configured by joining three refrigerant pipes 521 to one water pipe 525, and each refrigerant pipe 521 has one refrigerant flow path. The present invention can also be applied to such a pipe 520. That is, the pipe 520 is bent around the bending axis along the short side of the water pipe 525 that is a flat pipe.

(C)
In the above embodiment, the case where the refrigerant pipe 121 is a multi-hole flat pipe having a plurality of refrigerant flow paths 122a and 123a and the water pipe 125 is a flat pipe having one water flow path 125a has been described. However, in the heat exchanger according to the present invention, not only the refrigerant pipe but also the water pipe may be a multi-hole flat tube having a plurality of water flow paths. Moreover, although the refrigerant pipe has one refrigerant flow path, the water pipe may be constituted by a multi-hole flat tube.

  Furthermore, both the refrigerant pipe and the water pipe may be formed of a pipe having one flow path. However, in this case, it is assumed that the refrigerant tube and the water tube are formed of flat tubes.

(D)
In the above embodiment, it has been described that the switching operation of the bending direction (that is, the operation of switching the bending direction from the first direction A to the second direction B) is performed only once. However, the switching operation of the bending direction is not limited to once, and may be appropriately performed according to the length of the pipe 120, for example.

  For example, when the length of the pipe 120 is relatively short, the bending direction switching operation is not performed, and the pipe 120 may always be bent in one direction.

(E)
In the above-described embodiment, it has been described that the pipe 120 is bent and stacked at different radii of curvature according to the switching of the bending direction. However, even if the bending direction is switched, the pipe 120 may be bent and stacked in a single layer while drawing an arc having a certain radius of curvature.

  Moreover, in the said embodiment, as shown in FIG.7, 8, although the piping 120 demonstrated that it had two steps, the step 120a stacked inside, and the step 120b stacked outside, also about this step number It is not limited to two stages.

(F)
In addition, dimple-shaped recesses may be formed on the surfaces of the refrigerant pipe 121 and the water pipe 125 according to the present invention.

(G)
Moreover, the number and arrangement | sequence of the refrigerant flow paths 122a and 123a are not limited to FIGS. For example, two rows of three coolant channels may be formed in each of the multi-hole flat tubes 122 and 123.

(H)
Further, in the above embodiment uses CO ₂ as refrigerant, the type of the refrigerant is not limited to this. For example, hydrocarbons or chlorofluorocarbon refrigerants may be used as the high-temperature and high-pressure refrigerant.

  The heat exchanger according to the present invention has an effect that the first flow path and / or the second flow path can be prevented from being deformed due to deformation of the piping. This heat exchanger can be applied to a water heat exchanger related to a heat pump type hot water supply device and a heat exchanger related to an air conditioner.

DESCRIPTION OF SYMBOLS 1 Heat pump type hot water supply apparatus 2 Refrigeration apparatus 3 Hot water storage apparatus 22 Water heat exchanger 121 Refrigerant pipes 122 and 123 Multi-hole flat tubes 122a and 123a Refrigerant flow path 125 Water pipe 125a Water flow path ax1 Bending axis

JP 2007-271213 A JP 2004-218946 A

Claims (7)

A first pipe (125) having a first flow path (125a) through which the first fluid flows;
A second pipe (121) having a second flow path (122a, 123a) through which a second fluid different from the first fluid flows and formed by a flat pipe;
With
The first pipe (125) and the second pipe (121) are bonded adjacent to each other to form a pipe (120),
The pipe (120) is bent so as to draw an arc around the bending axis along the short side in the first cross section orthogonal to the longitudinal direction of the second pipe (121).
Heat exchanger (22). The second pipe (121) has a plurality of the second flow paths (122a, 123a) arranged along the long side of the first cross section.
The heat exchanger (22) according to claim 1. The pipe (120) has a rectangular second cross section orthogonal to the longitudinal direction,
The bending axis is substantially parallel to a short side of the second cross section of the pipe (120).
The heat exchanger (22) according to claim 1 or 2. The pipe (120) is bent a plurality of times around the bending axis and stacked in one direction along the bending axis.
The heat exchanger (22) according to any one of claims 1 to 3. The pipe (120) is bent a predetermined number of times in the first direction (A) around the bending axis, and then bent in a second direction (B) opposite to the first direction around the bending axis. ing,
The heat exchanger (22) according to claim 4. The pipe (120)
When bent in the first direction (A), it is piled up while drawing an arc of a first radius of curvature;
When bent in the second direction (B), the second radius of curvature is different from the first radius of curvature and is stacked while drawing an arc.
The heat exchanger (22) according to claim 5. The first pipe (125) is a flat pipe having one first flow path (125a),
The second pipe (121) has a plurality of the second flow paths (122a, 123a), and two are provided so as to sandwich one first pipe (125).
The heat exchanger (22) according to any one of claims 1 to 6.

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